Home / 2,140.72-3,211.76-1,297.40

Finding the Fourth Proportional to 2,140.72, 3,211.76 and 1,297.40

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Solution

The fourth proportional to 2,140.72, 3,211.76 and 1,297.40 is: 1,946.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,140.72 : 3,211.76 = 1,297.40 : x
  2. Step 2: Convert to fraction form
    2,140.72/3,211.76 = 1,297.40/x
  3. Step 3: Cross multiply
    2,140.72x = 3,211.76 × 1,297.40
  4. Step 4: Simplify right side
    2,140.72x = 4,166,937.42
  5. Step 5: Solve for x
    x = 4,166,937.42/2,140.72
  6. Step 6: Final answer
    x = 1,946.51

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.